Bimetallic Pd–Au/Highly Oriented Pyrolytic Graphite Catalysts: from Composition to Pairwise Parahydrogen Addition Selectivity | Sciact - CRIS-system of Boreskov Institute of Catalysis

Bimetallic Pd–Au/Highly Oriented Pyrolytic Graphite Catalysts: from Composition to Pairwise Parahydrogen Addition Selectivity Full article

Journal

The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455

Output data

Year: 2018, Volume: 122, Number: 32, Pages: 18588-18595 Pages count : 8 DOI: 10.1021/acs.jpcc.8b06281

Tags

PHOTOIONIZATION CROSS-SECTIONS; METAL-SUPPORT INTERACTIONS; INDUCED POLARIZATION; HETEROGENEOUS HYDROGENATION; MODEL CATALYSTS; ACTIVE-SITES; NANOPARTICLES; AU; GOLD; SPECTROSCOPY

Authors

Bukhtiyarov Andrey V. ¹ , Burueva Dudari B. ^2,3 , Prosvirin Igor P. ^1,3 , Klyushin Alexander Yu. ^4,5 , Panafidin Maxim A. ¹ , Kovtunov Kirill V. ^2,3 , Bukhtiyarov Valerii I. ¹ , Koptyug Igor V. ^2,3

Affiliations

1	Boreskov Institute of Catalysis SB RAS, 5 Acad. Lavrentiev Avenue, 630090 Novosibirsk, Russia
2	International Tomography Center SB RAS, 3A Institutskaya Street, 630090 Novosibirsk, Russia
3	Novosibirsk State University, 2 Pirogov Street, 630090 Novosibirsk, Russia
4	Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
5	Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Street 15, 12489 Berlin, Germany

Funding (4)

1	Russian Science Foundation	14-23-00146
2	Russian Science Foundation	17-73-20030
3	Helmholtz-Centre Berlin for Materials and Energy BESSY
4	Federal Agency for Scientific Organizations	0333-2018-0006 (II.1.13.1.)

The model Pd and Au mono- and bi-metallic (Pd-Au) catalysts were prepared using vapor deposition of metals (Au and/or Pd) under ultrahigh vacuum conditions on the defective highly oriented pyrolytic graphite (HOPG) surface. The model catalysts were investigated using the X-ray photoelectron spectroscopy and scanning tunneling microscopy at each stage of the preparation procedure. For the preparation of bimetallic catalysts, different procedures were used to get different structures of PdAu particles (Au-shell -Pd-core or alloyed). All prepared catalysts showed rather narrow particles size distribution with an average particles size in the range of 4-7 nm. Parahydrogen-enhanced nuclear magnetic resonance spectroscopy was used as a tool for the investigation of Pd-Au/ HOPG, Pd/HOPG, and Au/HOPG model catalysts in propyne hydrogenation. In contrast to Au sample, Pd, PdAualloy, and Au-shell-Pd-core samples were shown to have catalytic activity in propyne conversion, and pairwise hydrogen addition routes were observed. Moreover, bimetallic samples demonstrated the 2to 5-fold higher activity in pairwise hydrogen addition in comparison to the monometallic Pd sample. It was shown that the structures of bimetallic Pd-Au particles supported on HOPG strongly affected their activities and/or selectivities in propyne hydrogenation reaction: the catalyst with the Au-shell-Pd-core structure demonstrated higher pairwise selectivity than that with the PdAu(alloy )structure. Thus, the reported approach can be used as an effective tool for the synergistic effects investigations in hydrogenation reactions over model bimetallic Pd-Au catalysts, where the active component is supported on a planar support.

Bukhtiyarov A.V. , Burueva D.B. , Prosvirin I.P. , Klyushin A.Y. , Panafidin M.A. , Kovtunov K.V. , Bukhtiyarov V.I. , Koptyug I.V.
Bimetallic Pd–Au/Highly Oriented Pyrolytic Graphite Catalysts: from Composition to Pairwise Parahydrogen Addition Selectivity
The Journal of Physical Chemistry C. 2018. V.122. N32. P.18588-18595. DOI: 10.1021/acs.jpcc.8b06281 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Jul 2, 2018
Published online:	Jul 24, 2018
Published print:	Aug 16, 2018

Web of science:	WOS:000442462400044
Scopus:	2-s2.0-85050771074
Elibrary:	35789531
Chemical Abstracts:	2018:1369696
Chemical Abstracts (print):	169:321483
OpenAlex:	W2883225526

DB	Citing
Web of science	19
Scopus	20
Elibrary	21
OpenAlex	19